science

This particle is found in the nucleus and has no charge

• Neutron

• Orbital

• Proton

• Electron

All atoms of the same element are exactly alike and have the same ?

• Mass

• Element

• Electron

• Compound

Thomson discovered that atoms contain negatively charged particles each of these particles are called

(a)  

Rutherford concluded that the atom is mostly empty space but has a dense ,positive charge at its center .this dense center is called the

(a)  

The number of protons in the nucleus of an atom is the

(a)  

an isotope is identified by its

(a)  

What is the average mass of all the isotopes of that element

• Atomic mass

• Atomic number

• Chemical symbol

• No options are correct

(a)   is a chart showing all of the elements arranged according to the repeating pattern of their properties

The rows in the periodic table are known as periods

(a)  

In the groups of the periodic table how many columns are there

• 14

• 15

• 16

• 18